Dynamo-electric machine



D. L. SHEA DYNAMO ELECTRIC MACHINE Filed Oct. 20, 1921 Patented 7,19235.

UNITE sr DANIEL L. SHEA, ()F ST. LOUIS, MISSQURI, EiEifilIGNQE, BYIJEESNE ASSIGNMENTS, TO

WAGNER ELECTRIC CO EPOEELTZON, OF LDUIS,

DELA'WARE.

Application filed October 20, 1921.

To all whom '52. may concern:

Be it known that l, DANIEL L. SHEA, a citizen of the United States ofAmerica, residing at the city of St. Louis, State of Mi souri, United ofAmerica, have invented a certain new and useful Dynamo- Electrichilachine, of which the following is such a full, clear, and exactdescription as will enable any one skilled in the art to which itappertains to make and use the same, reference being had to theaccompanying drawings, forming part of this specification.

My invention relates to specific means for producing forced ventilationof dynamo electric machines of the type in which movable weights areused for actuating a switch under the influence of centrifugal force andit is the object of the invention to achieve this result simplyeconomically and without the necessity of any increase in the overalllength of the machine due to the addition of separate means forproducing said forced ventilation. Que 25 particular type of machine towhich my 1nvention is applicableis illustrated in VVeichscl UnitedStates Patent No. 1,214,980 issued February 6, 1917.

In the accompanying drawings, Figure 1 illustrates, partly in crosssection and partly in elevation, a sufficient portion of an electricmotor to show the embodiment and operation of my invention and Figure 2is an end view of the centrifugally operated weights showing also themeans of attachment to the rotor shaft.

in the drawings, 1 indicates the casing and 2 the end plate of a dynamoelectric machine, a stator coil being indicated by the numeral 3 androtor coil by the numeral The weights and 6 are pivoted to the rotorshaft 7 by means of a pin 8 extending through the shaft and through theears on the weights. These weights are shown in the position which theyoccupy when the machine is operating at a speed above that which issuiiicient to cause them to move from the stand-still position(indicated by dotted lines) and actuate the rods 9 and 10 which shift asuitable short circuiting mechanism such as shown in the Patent No.1,214,980 hereinabove referred to. The weights are provided withintegral webs or flanges 11 projecting from the body of thenYiveiuo-Etno'risio 'iuaon'inn.

Serial No. 588,907.

weight in a direction substantially parallel to the rotor shaft and inplanes substantially radial to that sh The outer edges of the fan blades11 are inclined toward the peripheries of the weights, thus permittingthe weights to have sufficient path of travel notwithstanding the closeproximity of the end plate to the weights and yet be of such-radiallength as to bring the fan blades to effective position under runningconditions. I

The end plate 2 is provided with openings 12 as shown and the flanges orprojections act as. fan'blades when the weights are in running positionand produce air currents past the ends of the stator windings 3 and overthe stator laminations 13 through spaces between them and the casing 1.By

li ZIEBSOUB I, A CORPQRATIEUN OF this action air is drawn into thecasing of the machine partly through the openings 12 in the end plate 2and partly through the rotor and air gap between the rotor and statorfrom the other end of the machine. The particular control anddistribution of the air currents within the machine and produced by theblades or projections on the weights being no part of my invention neednot be further described.

it will be noted that by forming the fan blades for the circulation ofair integral with the weights forced ventilation is socured in a veryeconomical manner and that no increase in the length of the machine isnecessary to accommodate these blades as would be the case if they wereattached to any other moving part. Having fully described my inventionwhat 1 cl im as new and desire to secure by Let ters Patent of theUnited States is:

l. A dynamo electric machine having centrifugally operating switchingmeans, said centrifugal means comprising a weight in pivotal relationwith the rotor and provided with a plurality of substantially triangularintegral projections adapted to act as fan blades for producing aircirculation about the parts of themachine when'the weight is in runningposition, said fan blades being positioned in planes radial to the rotorshaft with their bases nearest the shaft.

2. A dynamo electric machine having switching means comprising weight-spivoted on an axis in the plane of the rotor shaft axis and rotatable onsaid pivots, said Eorming; 1 1 dial (a the rotor shar" east the shaft.

21211021 'wlth the dis' f. lave hei'mm 'm 9-19:

3. A dynamo ele strivmzicnine having contrifugaliy operating; swibchingmeans c01n- Pnsmg a segmental. (1120 111 plvotal relation D UL T SHE).{15. 5.]

